netdb.h(3head) [opensolaris man page]

netdb.h(3HEAD)							      Headers							    netdb.h(3HEAD)

NAME

       netdb.h, netdb - definitions for network database operations

SYNOPSIS

       #include <netdb.h>

DESCRIPTION

       The <netdb.h> header defines the type in_port_t and the type in_addr_t as described in in.h(3HEAD).

       The <netdb.h> header defines the hostent structure that includes the following members:

	 char *h_name	       /* official name of the host */
	 char **h_aliases      /* pointer to an array of pointers to
				  alternative host names, terminated
				  by a null pointer */
	 int  h_addrtype       /* address type */
	 int  h_length	       /* length, in bytes, of the address */
	 char **h_addr_list    /* pointer to an array of pointers to
				  network addresses (in network byte
				  order)for the host, terminated by a
				  null pointer */

       The <netdb.h> header defines the netent structure that includes the following members:

	 char	   *n_name     /* official, fully-qualified */
				  (including the domain) name
				  of the network */
	 char	   **n_aliases /* pointer to an array of pointers to
				  alternative network names, terminated */
				  by a null pointer */
	 int	   n_addrtype  /* the address type of the network */
	 in_addr_t n_net       /* the network number, in host byte order */

       The <netdb.h> header defines the protoent structure that includes the following members:

	 char *p_name	      /* official name of the protocol */
	 char **p_aliases     /* pointer to an array of pointers to
				 alternative protocol names, terminated
				 by a null pointer */
	 int  p_proto	      /* protocol number */

       The <netdb.h> header defines the servent structure that includes the following members:

	 char *s_name	      /* oficial name of the service */
	 char **s_aliases     /* pointer to an array of pointers to
				 alternativeservice names, terminated by
				 a null pointer */
	 int  s_port	      /* port number at which the service
				 resides, in network byte order */
	 char *s_proto	      /* name of the protocol to use when
				 contacting the service */

       The <netdb.h> header defines the macro IPPORT_RESERVED with the value of the highest reserved Internet port number.

       The <netdb.h> header provides a declaration for h_errno:

       extern int h_errno;

       The <netdb.h> header defines the following macros for use as error values for gethostbyaddr() and gethostbyname():

       HOST_NOT_FOUND	   NO_DATA
       NO_RECOVERY	   TRY_AGAIN

       Inclusion of the <netdb.h> header may also make visible all symbols from in.h(3HEAD).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(3),  endhostent(3NSL),  endhostent(3XNET),  endnetent(3SOCKET),  endnetent(3XNET),  endprotoent(3SOCKET), endprotoent(3XNET), endser-
       vent(3SOCKET), endservent(3XNET), in.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    10 Sep 2004 						    netdb.h(3HEAD)

Check Out this Related Man Page

in.h(3HEAD)							      Headers							       in.h(3HEAD)

NAME

       in.h, in - Internet Protocol family

SYNOPSIS

       #include <netinet/in.h>

DESCRIPTION

       The <netinet/in.h> header defines the following types through typedef:

       in_port_t       An unsigned integral type of exactly 16 bits.

       in_addr_t       An  unsigned  integral  type  of exactly 32 bits. The <netinet/in.h> header defines the in_addr structure that includes the
		       following member:

       The <netinet/in.h> header defines the in_addr structure that includes the following member:

       in_addr_t       s_addr

       The <netinet/in.h> header defines the type sa_family_t as described in socket.h(3HEAD).

       The <netinet/in.h> header defines the following macros for use as values of the level argument of getsockopt() and setsockopt():

       IPPROTO_IP	       Dummy for  IP

       IPPROTO_ICMP	       Control message protocol

       IPPROTO_TCP	       TCP

       IPPROTO_UDP	       User datagram protocol The <netinet/in.h> header defines the following macros for use as destination addresses  for
			       connect(), sendmsg(), and sendto():

       INADDR_ANY	       Local host address

       INADDR_BROADCAST        Broadcast address

       The  <netinet/in.h>  header  defines the sockaddr_in structure that is used to store addresses for the Internet protocol family.  Values of
       this type must be cast to struct sockaddr for use with the socket interfaces.

   Default
       For applications that do not require standard-conforming behavior (those that use the socket interfaces described in section(3SOCKET)	of
       the reference manual; see Intro(3) and standards(5)), the <netinet/in.h> header defines the sockaddr_in structure that includes the follow-
       ing members:

       sa_family_t     sin_family
       in_port_t       sin_port
       struct in_addr  sin_addr
       char	       sin_zero[8]

   Standard conforming
       For applications that require standard-conforming behavior (those that use the socket interfaces described in section(3XNET) of the refer-
       ence  manual;  see Intro(3) and standards(5)), the <netinet/in.h> header defines the sockaddr_in structure that includes the following mem-
       bers:

       sa_family_t     sin_family
       in_port_t       sin_port
       struct in_addr  sin_addr
       unsigned char   sin_zero[8]

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(3), connect(3SOCKET), connect(3XNET),  getsockopt(3SOCKET),  getsockopt(3XNET),  sendmsg(3SOCKET),  sendmsg(3XNET),  sendto(3SOCKET),
       sendto(3XNET), setsockopt(3SOCKET), setsockopt(3XNET), socket.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    30 Aug 2002 						       in.h(3HEAD)

Linux and UNIX Man Pages

netdb.h(3head) [opensolaris man page]

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